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secure peer-to-peer VoIP server for the SIP protocol

GNU SIP Witch is a secure peer-to-peer VoIP server. Calls can be made
even behind NAT firewalls, and without needing a service provider. SIP
Witch can be used on the desktop to create bottom-up secure calling
networks as a free software alternative to Skype. SIP Witch can also
be used as a stand-alone SIP-based office telephone server, or to
create secure VoIP networks for an existing IP-PBX such as Asterisk,
FreeSWITCH, or Yate.